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KMID : 1011420090140040077
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Journal of Korean Ophthalmic Optics Society
2009 Volume.14 No. 4 p.77 ~ p.81
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Change of Fixation Disparity and Accommodation when the Fusion Contrast Varied
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Seo Jae-Myoung
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Abstract
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Purpose: To study the change of fixation disparity and accommodation as fusion contrast is deteriorated.
Methods: 16 subjects who had above 20/20 and stereopsis took part. Monocular and binocular refraction were done with Zeiss Polatest Classic whereas the critical angle for stereopsis was done with TNO. A computer programmed with Random-Dot stereogram and vernier test managed a precise change of the fusion contrast and exposure time.
Results: The fixation disparity was influenced by reduction of fusion contrast and had tendancy to exophoria (p=0.0004), especially it is considerably higher when uncrossed disparity was shown to exophoric subjects. Although accommodation was not influenced by a change of fusion contrast (p=0.803), vernier acuity was influenced (p=0.0000).
Conclusions: Exophoric trend arose as the fusion contrast was reduced, nevertheless there was no accommadative change.
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KEYWORD
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Fixation Disparity, Fusion Contrast, Accommodation, Vernier acuity
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